using System;
using System.Collections;
using System.Collections.Generic;
 
class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		
		int[] A=new int[400*7];
		//日月火水木金土
		//0 1 2 3 4 5 6 
		int y=2014;
		A[0]=3;
		int peri=1;
		for(int i=1;i<2800;i++){
			y=2014+i;
			int d=365;
			if(y%4==0)d++;
			if(y%100==0)d--;
			if(y%400==0)d++;
			A[i]=(A[i-1]+d)%7;
			if(A[i]==A[0])peri++;
		}
		long rest=N-2014;
		long ans=(rest/2800)*peri;
		rest-=(rest/2800);
		for(int i=0;i<=rest;i++){
			if(A[i]==A[0])ans++;
		}
		Console.WriteLine(ans-1);
		
		
		
		
	}
	long N;
	public Sol(){
		N=rl();
	}




	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}